Journal of Shandong University(Engineering Science) ›› 2018, Vol. 48 ›› Issue (6): 95-100.doi: 10.6040/j.issn.1672-3961.0.2018.267

• Electrical Engineering • Previous Articles     Next Articles

Novel traveling wave fault location method using overdetermined equations

Youmin LI1(),Shouguo LÜ1,Yang ZHOU1,Yaxin NIE2,*(),Mingliang JIA1,Bin BI1   

  1. 1. Shandong Electric Power Corporation Maintenance Company, Jinan 250118, Shandong, China
    2. School of Electrical Engineering Shandong University, Jinan 250061, Shandong, China
  • Received:2018-07-03 Online:2018-12-20 Published:2018-12-26
  • Contact: Yaxin NIE E-mail:271997530@qq.com;nieyaxin1112@163.com

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Abstract:

The uncertainty of traveling wave velocity brought the fault location measure error. In order to eliinate the influence of wave velocity, a two-terminal traveling wave fault location method for transmission lines based on overdetermined equation was proposed. This method first needed measure the arriving time of three waves, which were the travelling wave from the fault location to two terminals of the transmission lines, and the two refection waves between the opposite bus and the measure bus. Then with the parameters of the time and lines length, the overdetermined equations were constructed, whose solution could eliminate the uncertainty of traveling wave velocity. The simulation results showed that this method could effectively eliminate the influence of wave velocity, fault distance and ground resistance, and meanwhile show higher location precision and reliability in comparison with other traditional methods.

Key words: traveling wave, fault location, wavelet transform, wave velocity, overdetermined equations

CLC Number: 

  • TM773

Fig.1

The refraction and reflection traveling wave at node A"

Fig.2

Diagram of two terminal traveling wave fault location"

Fig.3

Diagram of traveling wave propagation"

Fig.4

Structure diagram of simulation model"

Fig.5

Voltage traveling wave of M and N terminals of phase A"

Fig.6

Mode 1 of traveling wave of M and N terminals"

Fig.7

Wavelet modulus maximumof M and N terminals"

Table 1

Simulation results of traditional method"

序号 故障点与M端距离/km 接地电阻/Ω t1/μs t3/μs 距离/km 误差/km
1 120 10 20 410 20 098 119.650 0.350
50 20 410 20 098 119.650 0.350
2 90 10 20 306 20 202 89.151 0.849
50 20 306 20 202 89.151 0.849
3 65 10 20 219 20 289 65.903 0.903
50 20 219 20 289 65.903 0.903
4 40 10 20 133 20 375 40.615 0.615
50 20 133 20 375 40.615 0.615
5 20 10 20 064 20 444 20.382 0.382
50 20 064 20 444 20.382 0.382

Table 2

Simulation results of the proposed method"

序号 故障点与M端距离/km 接地电阻/Ω t1/μs t2/μs t3/μs t4/μs 距离/km 误差/km
1 120 10 20 410 20 614 20 098 20 926 120.148 0.148
50 20 410 20 614 20 098 20 926 120.148 0.148
2 90 10 20 306 20 715 20 202 20 817 90.087 0.087
50 20 306 20 718 20 202 20 819 90.014 0.014
3 65 10 20 219 20 802 20 289 20 738 65.262 0.262
50 20 219 20 802 20 289 20 738 65.262 0.262
4 40 10 20 133 20 886 20 375 20 648 39.912 0.087
50 201 33 20 889 20 375 206 49 39.854 0.146
5 20 10 20 064 20 952 20 444 20 583 20.208 0.208
50 20 064 20 958 20 444 20 581 19.860 0.140
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